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Wysocki" Date: Tue, 17 Jul 2018 11:06:29 +0200 X-Google-Sender-Auth: cD83MyQbgc-lh7NNBC2kHIQG03w Message-ID: Subject: Re: Commit 554c8aa8ecad causing severe performance degression with pcc-cpufreq To: Andreas Herrmann Cc: "Rafael J. Wysocki" , "Rafael J. Wysocki" , Peter Zijlstra , Frederic Weisbecker , Viresh Kumar , Linux PM , Linux Kernel Mailing List Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 17, 2018 at 10:50 AM, Andreas Herrmann wrote: [cut] > > On balance before this commit users could use pcc-cpufreq but had > already suboptimal performance (compared to say intel_pstate driver > which can be used changing BIOS options). BTW, I wonder why you need to change the BIOS options for intel_pstate to load. It should be initialized before pcc-cpufreq (according to their respective initcall levels), so in theory intel_pstate should be used by default on the affected systems anyway. What BIOS settings need to be changed for that?